<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>案例5</title>
		<style type="text/css">
			* {
				margin: 0;
				padding: 0;
			}

			div {
				width: 300px;
				height: 100px;
				margin: 50px auto;
			}
		</style>
	</head>
	<body>
		<div>
			<input type="button" value="毫无用处的按钮" id="btn1">
			<input type="button" value="绑定click" id="btn2">
			<input type="button" value="解除绑定" id="btn3">
		</div>
	</body>
</html>
<script src="../js/jquery-3.5.1.min.js" type="text/javascript" charset="utf-8"></script>
<script src="./js/test5.js" type="text/javascript" charset="utf-8"></script>
